STOCKHOLM (Reuters) - Scientists have found a cluster of
spruces in the mountains in western Sweden which, at an age of
8,000 years, may be the world's oldest living trees.

The hardy Norway spruces were found perched high on a
mountain side where they have remained safe from recent dangers
such as logging, but exposed to the harsh weather conditions of
the mountain range that separates Norway and Sweden.

Carbon dating of the trees carried out at a laboratory in
Miami, Florida, showed the oldest of them first set root about
8,000 years ago, making it the world's oldest known living
tree, Umea University Professor Leif Kullman said.

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California's "Methuselah" tree, a Great Basin bristlecone
pine, is often cited as the world's oldest living tree with a
recorded age of between 4,500 and 5,000 years.

Two other spruces, also found in the course of climate
change studies in the Swedish county of Dalarna, were shown to
be 4,800 and 5,500 years old.

"These were the first woods that grew after the Ice Age,"
said Lars Hedlund, responsible for environmental surveys in the
county of Dalarna and collaborator in climate studies there.

"That means that when you speak of climate change today,
you can in these (trees) see pretty much every single climate
change that has occurred."

Although a single tree trunk can become at most about 600
years old, the spruces had survived by pushing out another
trunk as soon as the old one died, Professor Kullman said.

Rising temperatures in the area in recent years had allowed
the spruces to grow rapidly, making them easier to find in the
rugged terrain, he added.

"For quite some time they have endured as bushes maybe 1/2
meter tall," he said.

"But over the past few decades we have seen a much warmer
climate, which has meant that they have popped up like
mushrooms in the soil."